L'Ascension is a suite of four symphonic meditations for orchestra which, with the exception of its third movement, were later arranged for pipe organ in 1933-1934. The work was written by the French composer Olivier Messiaen from 1932 to 1933 in Paris, Neuchâtel, and Monaco. It was premièred under the direction of Robert Siohan at the Salle Rameau in Paris on 9 February 1935. It is one of his first major works ; and, in both of its iterations, among his most well-known.

Olivier Eugène Prosper Charles Messiaen was a French composer, organist, and ornithologist. One of the major composers of the 20th century, he was also an outstanding teacher of composition and musical analysis.